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섬유 수분 보수력 측정을 통한 셀룰로오스 나노섬유의 피브릴화 특성 평가
송우용(Woo-Yong Song),정수빈(Su Bin Jeong),전소영(So Young Juhn),신수정(Soo-Jeong Shin) 한국펄프·종이공학회 2019 펄프.종이技術 Vol.51 No.1
When water retention value (WRV) method was applied in cellulose nanofibril characterization for fibrillation, there were problems from plugging or passing through filter by cellulose nanofibrils. To solve these problem, a two step WRV method was proposed. Pulp mats were formed with a commercial chemical pulp by 1st WRV process and cellulose nanofibril suspensions were run for 2nd WRV process. There was no plugging or passing problems with pulp mat formed with more than 1.0 of pulp (oven-dried basis). With different centrifugal force and times, optimum condition for 2nd WRV process was 6,000 G with 40 min with constant WRV values. Cellulose nanofbiril with more carboxymethyl group had higher WRV value than other from degree of substitution 0.2 to 0.4. Fibrillation characteristics of cellulose nanofibrils was also compared by TEM image analysis and reached similar result between WRV and TEM image analysis.
Zahra Audrey,Gao Shangmin,Park Jong-Moon,Shin Soo-Jeong 한국펄프.종이工學會 2022 펄프.종이기술 Vol.54 No.3
Rice is widely produced; however, large quantities of non-edible biomass are also generated during its production, mainly straw and hulls. These lignocellulosic materials have great value potential but are less used than other biomass resources. We produced cellulose nanofiber (CNF) from rice husks through delignification (as chlorine dioxide bleaching), pretreatment (as carboxymethylation substitution reaction), and nanofiber-making processes (as supermass-collider grinding and high-pressure homogenization). The rheological properties of rice-hull cellulose nanofiber were investigated to determine the relationship between carboxyl content, number of grinding, and high-pressure homogenization to rheological properties of rice-husk CNF gels. Increased carboxymethylation and mechanical treatments lead to higher viscosity, better hydrogel strength, and water retention value (WRV). Further mechanical processes decreased the viscosity and hydrogel strength after attaining the maximum value. For high-quality hydrogel production, optimum pretreatment and mechanical processes are required as pretreatment to DS 0.3 for carboxymethylation and optimum grinding and high-pressure homogenization combination.
활엽수크라프트펄프 및 박테리아 셀룰로오스부터 제조한 종이의 물성
조남석,김영신,박종문,민두식,안드레레오노비치 한국펄프종이공학회 1997 펄프.종이기술 Vol.29 No.4
Most cellulose resources come from the higher plants, but bacteria also synthesize same cellulose as in plants. Many scientists have been widely studied on the bacterial cellulose, the process development, manufacturing, even marketing of cellulose fibers. The bacterial celluloses are very different in its physical and morphological structures. These fibers have many unique properties that are potentially and commercially beneficial. The fine fibers can produce a smooth paper with enchanced its strength property. But there gave been few reports on the mechanical properties of the processing of bacterial cellulose into structural materials. This study were performed to elucidate the mechanical properties of sheets prepared from bacterial cellulose. Also reinforcing effect of bacterial cellulose on the conventional pulp paper as well as surface structures by scanning electron microscopy were discussed. Paper made from bacterial cellulose is 10 times much stronger than ordinary chemical pulp sheet, and the mixing of bacterial cellulose has a remarkable reinforcing effect on the papers. Mechanical strengthes were increased with the increase of bacterial cellulose content in the sheet. This strength increase corresponds to the increasing water retention value and sheet density with the increase of bacterial cellulose content. Scanning electron micrographs were shown that fine microfibrills of bacterial celluloses covered on the surfaces of hardwood pulp fibers, and enhanced sheet strength by its intimate fiber bonding.
박종신 서울대학교 농업개발연구소 1999 농업생명과학연구 Vol.3 No.-
Starch-based superabsorbent materials, HSPAN, were prepared by the continuous method and the batch method. The continuous method was characterized by the omission of washing and drying process after graft-copolymerization of starch and AN. Absorbencies of HSPAN prepared by the continuous method(C-HSPAN) were similar to those of HSPAN prepared by the batch method(B-HSPAN). And the hydrolysis time for obtaining the maximum absorbency from SPAN containing 25% of PAN content was shorter in the continuous method. But C-HSPAN required more NaOH for obtaining the maximum absorbency during the hydrolysis than B-HSPAN. In terms of the rate of absorption, the two different methods produced almost the same products and the time required for reaching equilibrium value increased with %PAN. HSPAN prepared by both continuous and batch methods showed the water retention value of 70~80%. And no distinct differences between the values were found in two methods.
섬유 보수력 측정법을 통한 셀룰로오스 나노섬유의 특성 분석
송우용,신수정 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
셀룰로오스 나노섬유의 나노섬유화 특성을 분석하는 방법은 일반적으로 전자현미경이나 원자 현미경을 통한 직접 관찰을 통해 분석한다. 하지만 이러한 방법을 사용하는 것은 현미경 관찰용 시료를 제작하는데 비용과 시간이 투자되며, 특히 셀룰로오스 나노섬유를 관찰하는데 많은 시간이 소요된다. 이러한 문제를 해결하고자 기존 펄프 제지산업에 사용되는 섬유 보수력 측정법을 사용하여 셀룰로오스 나노섬유의 보수력을 측정하여 나노섬유화 정도를 측정하고자 하였다. 치환도에 따른 셀룰로오스 나노섬유의 보수력 측정 결과 치환도가 증가함에 따라 셀룰로오스 나노섬유의 보수력이 증가가 확인되었다. 셀룰로오스 나노섬유의 나노섬유화를 투과 전자현미경으로 확인한 결과 치환도가 낮을 때, 일부 나노섬유가 명확히 분리되지 않은 섬유가 확인 되었으며, 치환도가 증가함에 따라 나노섬유 분리가 대부분 일어난 것이 확인되었다.